QSignalTransition Class Reference

[QtCore module]

The QSignalTransition class provides a transition based on a Qt signal. More…

Inherits QAbstractTransition.

Methods

• __init__ (self, QState sourceState = None)
• __init__ (self, QObject sender, SIGNAL() signal, QState sourceState = None)
• __init__ (self, signal signal, QState sourceState = None)
• bool event (self, QEvent e)
• bool eventTest (self, QEvent event)
• onTransition (self, QEvent event)
• QObject senderObject (self)
• setSenderObject (self, QObject sender)
• setSignal (self, QByteArray signal)
• QByteArray signal (self)

Detailed Description

The QSignalTransition class provides a transition based on a Qt signal.

通常，您将使用的过载QState.addTransition（）采用一个发送器和信号作为参数，而不是创建QSignalTransition直接对象。 QSignalTransition是一部分The State Machine Framework。

你可以继承QSignalTransition和重新实现eventTest（ ）方法使一个信号转换条件;传递给事件对象eventTest（）将一个QStateMachine.SignalEvent对象。例如：

 class CheckedTransition : public QSignalTransition
 {
 public:
     CheckedTransition([QCheckBox](docs_qcheckbox.html) *check)
         : QSignalTransition(check, SIGNAL(stateChanged(int))) {}
 protected:
     bool eventTest([QEvent](docs_qevent.html) *e) {
         if (!QSignalTransition.eventTest(e))
             return false;
         [QStateMachine](docs_qstatemachine.html).SignalEvent *se = static_cast<[QStateMachine](docs_qstatemachine.html).SignalEvent*>(e);
         return (se->arguments().at(0).toInt() == [Qt](docs_qt.html).Checked);
     }
 };
 ...
 [QCheckBox](docs_qcheckbox.html) *check = new [QCheckBox](docs_qcheckbox.html)();
 check->setTristate(true);
 [QState](docs_qstate.html) *s1 = new [QState](docs_qstate.html)();
 [QState](docs_qstate.html) *s2 = new [QState](docs_qstate.html)();
 CheckedTransition *t1 = new CheckedTransition(check);
 t1->setTargetState(s2);
 s1->addTransition(t1);

Method Documentation

QSignalTransition.__init__ (self, QState sourceState = None)

该sourceState的说法，如果不是没有，原因self通过Qt的，而不是PyQt的拥有。

构造具有给定一个新的信号转换sourceState。

QSignalTransition.__init__ (self, QObject sender, SIGNAL() signal, QState sourceState = None)

该sourceState的说法，如果不是没有，原因self通过Qt的，而不是PyQt的拥有。

构造具有给定关联的一个新的信号转换signal的给定sender，并用给定的sourceState。

QSignalTransition.__init__ (self, signal signal, QState sourceState = None)

该sourceState的说法，如果不是没有，原因self通过Qt的，而不是PyQt的拥有。

bool QSignalTransition.event (self, QEvent e)

从重新实现QObject.event（ ） 。

bool QSignalTransition.eventTest (self, QEvent event)

从重新实现QAbstractTransition.eventTest（ ） 。

默认实现返回True，如果event是QStateMachine.SignalEvent对象和事件的发送者和信号索引匹配这个过渡，否则返回False 。

QSignalTransition.onTransition (self, QEvent event)

从重新实现QAbstractTransition.onTransition（ ） 。

QObject QSignalTransition.senderObject (self)

[

QSignalTransition.setSenderObject (self, QObject sender)

QSignalTransition.setSignal (self, QByteArray signal)

](docs_qobject.html)

QByteArray QSignalTransition.signal (self)